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Addition to the last letter (17 July) about hermitic operators. Pauli talks about the five dimentional formalism.

Pauli writes more about hermitic operators.

Pauli writes about the impossibility of half-integer spin in a theory with a four-vector Psi which is quantized according to Fermi statistics. He writes also of the five-dimensional theory and its prospects.

Pauli refers Klein to Belinfante (Physica) for side conditions needed for Klein's equations. Pauli describes the conditions.

Pauli writes more about his plans for his visit to Sweden.

Pauli reports in detail on Pais' lecture in Holland on "isotopic spin and mass quantization" and on his introduction of the "W-space". Pauli writes about Jordan's cosmological equations. Pauli thinks that Einstein's model is simpler and more convincing. He does not see the advantage of the introduction of a changing gravitational constant. The appendix contains ideas about the statistical theory of heat.

Pauli requests reprints of Wergeland's latest work for a letter of recommendation.

Pauli describes his role in preparation of the Bohr Festschrift. Pauli gives his views on biological questions.

Pauli writes of his doubts concerning commutators in Klein's Bohr-Festschrift article.

Pauli makes comments on the second draft of Klein's article.